United go to Nottingham Forest today seeking a fourth consecutive Premier League win.
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Amorim said, "There were some moments that were tough to deal with. To lose so many games, that was so hard for me because this is Manchester United.
"The position that we had in the last year, putting all the attention on the Europa League and not winning, that was massive.
"So I had some moments that I struggled a lot, and I was thinking that maybe it's not meant to be.
"Today is the opposite. Today I feel that, and I know that, it was the best decision in my life and I want to be here.
"I trust my players more, I think they trust me more. That will come with wins, and you can sense that."